#sidebar { overflow-y: hidden; overflow-x: hidden; }
#sidebar ::-webkit-scrollbar{ display:none }

#sidebar:hover { overflow-y:auto; overflow-y:overlay }
#sidebar:hover ::-webkit-scrollbar { display:block }

#sidebar ::-webkit-scrollbar { -webkit-appearance:none }
#sidebar ::-webkit-scrollbar-thumb {
  box-shadow: inset 0 -2px,inset 0 -8px,inset 0 2px,inset 0 8px;
  min-height: 36px
}

